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Diffstat (limited to 'drivers/acpi/pci_irq.c')
-rw-r--r--drivers/acpi/pci_irq.c517
1 files changed, 517 insertions, 0 deletions
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
new file mode 100644
index 000000000..b1def411c
--- /dev/null
+++ b/drivers/acpi/pci_irq.c
@@ -0,0 +1,517 @@
+/*
+ * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
+ *
+ * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
+ * (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
+ * Bjorn Helgaas <bjorn.helgaas@hp.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+
+#include <linux/dmi.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/pm.h>
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/slab.h>
+
+#define PREFIX "ACPI: "
+
+#define _COMPONENT ACPI_PCI_COMPONENT
+ACPI_MODULE_NAME("pci_irq");
+
+struct acpi_prt_entry {
+ struct list_head list;
+ struct acpi_pci_id id;
+ u8 pin;
+ acpi_handle link;
+ u32 index; /* GSI, or link _CRS index */
+};
+
+static inline char pin_name(int pin)
+{
+ return 'A' + pin - 1;
+}
+
+/* --------------------------------------------------------------------------
+ PCI IRQ Routing Table (PRT) Support
+ -------------------------------------------------------------------------- */
+
+/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
+static const struct dmi_system_id medion_md9580[] = {
+ {
+ .ident = "Medion MD9580-F laptop",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
+ },
+ },
+ { }
+};
+
+/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
+static const struct dmi_system_id dell_optiplex[] = {
+ {
+ .ident = "Dell Optiplex GX1",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
+ },
+ },
+ { }
+};
+
+/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
+static const struct dmi_system_id hp_t5710[] = {
+ {
+ .ident = "HP t5710",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
+ DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
+ },
+ },
+ { }
+};
+
+struct prt_quirk {
+ const struct dmi_system_id *system;
+ unsigned int segment;
+ unsigned int bus;
+ unsigned int device;
+ unsigned char pin;
+ const char *source; /* according to BIOS */
+ const char *actual_source;
+};
+
+#define PCI_INTX_PIN(c) (c - 'A' + 1)
+
+/*
+ * These systems have incorrect _PRT entries. The BIOS claims the PCI
+ * interrupt at the listed segment/bus/device/pin is connected to the first
+ * link device, but it is actually connected to the second.
+ */
+static const struct prt_quirk prt_quirks[] = {
+ { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
+ "\\_SB_.PCI0.ISA_.LNKA",
+ "\\_SB_.PCI0.ISA_.LNKB"},
+ { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
+ "\\_SB_.LNKB",
+ "\\_SB_.LNKA"},
+ { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
+ "\\_SB_.PCI0.LNK1",
+ "\\_SB_.PCI0.LNK3"},
+};
+
+static void do_prt_fixups(struct acpi_prt_entry *entry,
+ struct acpi_pci_routing_table *prt)
+{
+ int i;
+ const struct prt_quirk *quirk;
+
+ for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
+ quirk = &prt_quirks[i];
+
+ /* All current quirks involve link devices, not GSIs */
+ if (!prt->source)
+ continue;
+
+ if (dmi_check_system(quirk->system) &&
+ entry->id.segment == quirk->segment &&
+ entry->id.bus == quirk->bus &&
+ entry->id.device == quirk->device &&
+ entry->pin == quirk->pin &&
+ !strcmp(prt->source, quirk->source) &&
+ strlen(prt->source) >= strlen(quirk->actual_source)) {
+ printk(KERN_WARNING PREFIX "firmware reports "
+ "%04x:%02x:%02x PCI INT %c connected to %s; "
+ "changing to %s\n",
+ entry->id.segment, entry->id.bus,
+ entry->id.device, pin_name(entry->pin),
+ prt->source, quirk->actual_source);
+ strcpy(prt->source, quirk->actual_source);
+ }
+ }
+}
+
+static int acpi_pci_irq_check_entry(acpi_handle handle, struct pci_dev *dev,
+ int pin, struct acpi_pci_routing_table *prt,
+ struct acpi_prt_entry **entry_ptr)
+{
+ int segment = pci_domain_nr(dev->bus);
+ int bus = dev->bus->number;
+ int device = PCI_SLOT(dev->devfn);
+ struct acpi_prt_entry *entry;
+
+ if (((prt->address >> 16) & 0xffff) != device ||
+ prt->pin + 1 != pin)
+ return -ENODEV;
+
+ entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+
+ /*
+ * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
+ * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
+ * it here.
+ */
+ entry->id.segment = segment;
+ entry->id.bus = bus;
+ entry->id.device = (prt->address >> 16) & 0xFFFF;
+ entry->pin = prt->pin + 1;
+
+ do_prt_fixups(entry, prt);
+
+ entry->index = prt->source_index;
+
+ /*
+ * Type 1: Dynamic
+ * ---------------
+ * The 'source' field specifies the PCI interrupt link device used to
+ * configure the IRQ assigned to this slot|dev|pin. The 'source_index'
+ * indicates which resource descriptor in the resource template (of
+ * the link device) this interrupt is allocated from.
+ *
+ * NOTE: Don't query the Link Device for IRQ information at this time
+ * because Link Device enumeration may not have occurred yet
+ * (e.g. exists somewhere 'below' this _PRT entry in the ACPI
+ * namespace).
+ */
+ if (prt->source[0])
+ acpi_get_handle(handle, prt->source, &entry->link);
+
+ /*
+ * Type 2: Static
+ * --------------
+ * The 'source' field is NULL, and the 'source_index' field specifies
+ * the IRQ value, which is hardwired to specific interrupt inputs on
+ * the interrupt controller.
+ */
+
+ ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
+ " %04x:%02x:%02x[%c] -> %s[%d]\n",
+ entry->id.segment, entry->id.bus,
+ entry->id.device, pin_name(entry->pin),
+ prt->source, entry->index));
+
+ *entry_ptr = entry;
+
+ return 0;
+}
+
+static int acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
+ int pin, struct acpi_prt_entry **entry_ptr)
+{
+ acpi_status status;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct acpi_pci_routing_table *entry;
+ acpi_handle handle = NULL;
+
+ if (dev->bus->bridge)
+ handle = ACPI_HANDLE(dev->bus->bridge);
+
+ if (!handle)
+ return -ENODEV;
+
+ /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
+ status = acpi_get_irq_routing_table(handle, &buffer);
+ if (ACPI_FAILURE(status)) {
+ kfree(buffer.pointer);
+ return -ENODEV;
+ }
+
+ entry = buffer.pointer;
+ while (entry && (entry->length > 0)) {
+ if (!acpi_pci_irq_check_entry(handle, dev, pin,
+ entry, entry_ptr))
+ break;
+ entry = (struct acpi_pci_routing_table *)
+ ((unsigned long)entry + entry->length);
+ }
+
+ kfree(buffer.pointer);
+ return 0;
+}
+
+/* --------------------------------------------------------------------------
+ PCI Interrupt Routing Support
+ -------------------------------------------------------------------------- */
+#ifdef CONFIG_X86_IO_APIC
+extern int noioapicquirk;
+extern int noioapicreroute;
+
+static int bridge_has_boot_interrupt_variant(struct pci_bus *bus)
+{
+ struct pci_bus *bus_it;
+
+ for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) {
+ if (!bus_it->self)
+ return 0;
+ if (bus_it->self->irq_reroute_variant)
+ return bus_it->self->irq_reroute_variant;
+ }
+ return 0;
+}
+
+/*
+ * Some chipsets (e.g. Intel 6700PXH) generate a legacy INTx when the IRQ
+ * entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel does
+ * during interrupt handling). When this INTx generation cannot be disabled,
+ * we reroute these interrupts to their legacy equivalent to get rid of
+ * spurious interrupts.
+ */
+static int acpi_reroute_boot_interrupt(struct pci_dev *dev,
+ struct acpi_prt_entry *entry)
+{
+ if (noioapicquirk || noioapicreroute) {
+ return 0;
+ } else {
+ switch (bridge_has_boot_interrupt_variant(dev->bus)) {
+ case 0:
+ /* no rerouting necessary */
+ return 0;
+ case INTEL_IRQ_REROUTE_VARIANT:
+ /*
+ * Remap according to INTx routing table in 6700PXH
+ * specs, intel order number 302628-002, section
+ * 2.15.2. Other chipsets (80332, ...) have the same
+ * mapping and are handled here as well.
+ */
+ dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy "
+ "IRQ %d\n", entry->index,
+ (entry->index % 4) + 16);
+ entry->index = (entry->index % 4) + 16;
+ return 1;
+ default:
+ dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy "
+ "IRQ: unknown mapping\n", entry->index);
+ return -1;
+ }
+ }
+}
+#endif /* CONFIG_X86_IO_APIC */
+
+static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
+{
+ struct acpi_prt_entry *entry = NULL;
+ struct pci_dev *bridge;
+ u8 bridge_pin, orig_pin = pin;
+ int ret;
+
+ ret = acpi_pci_irq_find_prt_entry(dev, pin, &entry);
+ if (!ret && entry) {
+#ifdef CONFIG_X86_IO_APIC
+ acpi_reroute_boot_interrupt(dev, entry);
+#endif /* CONFIG_X86_IO_APIC */
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
+ pci_name(dev), pin_name(pin)));
+ return entry;
+ }
+
+ /*
+ * Attempt to derive an IRQ for this device from a parent bridge's
+ * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
+ */
+ bridge = dev->bus->self;
+ while (bridge) {
+ pin = pci_swizzle_interrupt_pin(dev, pin);
+
+ if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
+ /* PC card has the same IRQ as its cardbridge */
+ bridge_pin = bridge->pin;
+ if (!bridge_pin) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "No interrupt pin configured for device %s\n",
+ pci_name(bridge)));
+ return NULL;
+ }
+ pin = bridge_pin;
+ }
+
+ ret = acpi_pci_irq_find_prt_entry(bridge, pin, &entry);
+ if (!ret && entry) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Derived GSI for %s INT %c from %s\n",
+ pci_name(dev), pin_name(orig_pin),
+ pci_name(bridge)));
+ return entry;
+ }
+
+ dev = bridge;
+ bridge = dev->bus->self;
+ }
+
+ dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
+ pin_name(orig_pin));
+ return NULL;
+}
+
+#if IS_ENABLED(CONFIG_ISA) || IS_ENABLED(CONFIG_EISA)
+static int acpi_isa_register_gsi(struct pci_dev *dev)
+{
+ u32 dev_gsi;
+
+ /* Interrupt Line values above 0xF are forbidden */
+ if (dev->irq > 0 && (dev->irq <= 0xF) &&
+ (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
+ dev_warn(&dev->dev, "PCI INT %c: no GSI - using ISA IRQ %d\n",
+ pin_name(dev->pin), dev->irq);
+ acpi_register_gsi(&dev->dev, dev_gsi,
+ ACPI_LEVEL_SENSITIVE,
+ ACPI_ACTIVE_LOW);
+ return 0;
+ }
+ return -EINVAL;
+}
+#else
+static inline int acpi_isa_register_gsi(struct pci_dev *dev)
+{
+ return -ENODEV;
+}
+#endif
+
+int acpi_pci_irq_enable(struct pci_dev *dev)
+{
+ struct acpi_prt_entry *entry;
+ int gsi;
+ u8 pin;
+ int triggering = ACPI_LEVEL_SENSITIVE;
+ int polarity = ACPI_ACTIVE_LOW;
+ char *link = NULL;
+ char link_desc[16];
+ int rc;
+
+ pin = dev->pin;
+ if (!pin) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "No interrupt pin configured for device %s\n",
+ pci_name(dev)));
+ return 0;
+ }
+
+ if (dev->irq_managed && dev->irq > 0)
+ return 0;
+
+ entry = acpi_pci_irq_lookup(dev, pin);
+ if (!entry) {
+ /*
+ * IDE legacy mode controller IRQs are magic. Why do compat
+ * extensions always make such a nasty mess.
+ */
+ if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
+ (dev->class & 0x05) == 0)
+ return 0;
+ }
+
+ if (entry) {
+ if (entry->link)
+ gsi = acpi_pci_link_allocate_irq(entry->link,
+ entry->index,
+ &triggering, &polarity,
+ &link);
+ else
+ gsi = entry->index;
+ } else
+ gsi = -1;
+
+ /*
+ * No IRQ known to the ACPI subsystem - maybe the BIOS /
+ * driver reported one, then use it. Exit in any case.
+ */
+ if (gsi < 0) {
+ if (acpi_isa_register_gsi(dev))
+ dev_warn(&dev->dev, "PCI INT %c: no GSI\n",
+ pin_name(pin));
+
+ kfree(entry);
+ return 0;
+ }
+
+ rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
+ if (rc < 0) {
+ dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
+ pin_name(pin));
+ kfree(entry);
+ return rc;
+ }
+ dev->irq = rc;
+ dev->irq_managed = 1;
+
+ if (link)
+ snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
+ else
+ link_desc[0] = '\0';
+
+ dev_dbg(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
+ pin_name(pin), link_desc, gsi,
+ (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
+ (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
+
+ kfree(entry);
+ return 0;
+}
+
+void acpi_pci_irq_disable(struct pci_dev *dev)
+{
+ struct acpi_prt_entry *entry;
+ int gsi;
+ u8 pin;
+
+ pin = dev->pin;
+ if (!pin || !dev->irq_managed || dev->irq <= 0)
+ return;
+
+ /* Keep IOAPIC pin configuration when suspending */
+ if (dev->dev.power.is_prepared)
+ return;
+#ifdef CONFIG_PM
+ if (dev->dev.power.runtime_status == RPM_SUSPENDING)
+ return;
+#endif
+
+ entry = acpi_pci_irq_lookup(dev, pin);
+ if (!entry)
+ return;
+
+ if (entry->link)
+ gsi = acpi_pci_link_free_irq(entry->link);
+ else
+ gsi = entry->index;
+
+ kfree(entry);
+
+ /*
+ * TBD: It might be worth clearing dev->irq by magic constant
+ * (e.g. PCI_UNDEFINED_IRQ).
+ */
+
+ dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
+ if (gsi >= 0) {
+ acpi_unregister_gsi(gsi);
+ dev->irq_managed = 0;
+ }
+}
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